News on diagnostic systems for drugs of abuse and toxicology.
The guidelines are the first to attempt to specify which drugs are appropriate to test for routinely, guideline authors say.
Qualitative testing offers more specificity and sensitivity than current frontline immunoassay-based testing, the group said in its guidelines.
By dropping the cutoff value in urine immunoassay testing to 20 from 100, the researchers reduced the false-negative rate to 2 percent from 47 percent.
Dominion Diagnostics will pay $815,000 to settle allegations by the US Attorney's Office and Vermont that it improperly billed for tests.
A combined biomarker model was more sensitive and specific than a standard test in identifying patients with liver injury after overdosing on paracetamol.